Sandpapering-machine.



L. H. BRECKENKAMP.

SANDPAPERING MACHINE. APPLICATION FILED DEG. so, 1909.

971, 1 1 Patented Sept. 27, 1910.

2 SHEETBSHEET l.

L. H. BREGKENKAMP. SANDPAPERING MACHINE. APPLICATION FILED DEO.30,1909.

9? L, 1 1 4, Patented Sept. 27, 1910.

2 SHEETSSHEBT 2,

WTTED %TAT% PATENT OFF.

LOUIS H. BRECKENKAMP, OF ST. LOUIS, MISSOURI, ASSIGNOR F ONE-HALF TOJOSEPH C. MILLER, OF ST. LOUIS, MISSOURI.

SANDIPAPERING-MAOI-IINE.

Specification of Letters Patent. Patented Sept, 27, 1910.

Application filed December 30, 1909. Serial No. 535,690.

To all whom it may concern:

Be it known that I, LOUIS H. BRECKEN- Kiirir, a citizen of the UnitedStates, and resident of St. Louis, Missouri, have invented certain newand useful Improvements in Sandpapering-ht[achines, of which thefollowing is a specification.

This invention relates to improvements in sandpapering machines, and hasfor its objcct to provide endless abrasive belts rotatably mounted abovea table and a carriage on which the material to be sandpapered ismounted and brought in contact with the belt in observation of theoperator.

A further object of my invention is to construct a machine having aplurality of endless abrasive belts located above a table with which thearticle to be worked is brought in contact in the view of the operator.

In the drawings Figure 1 is a side elevation of my complete invention.Fig. 2 is a front view of the same. Fig. 3 is a detail perspective Viewof a portion of one of the sides of the supporting frame and the idleroller carried thereon. Fig. 4 is an enlarged detail sectional view ofone of the sanding pulleys made use of in carrying out my invent-ion.Fig. 5 is a perspective View of the carriage used for supporting thearticle to be worked. Fig. 6 is a detail perspective view of the lowerend of one of the guy rods for supporting the frame.

Referring to the drawings in detail, 7 indicates a pair of telescopiccolumns provided with pedestals 8 by which the same are securelysupported to the floor, the inner tubes 9 of the columns 7 are alsoprovided with capitals 10 by which the same are supported to the ceiling11, the purpose of the telescopic columns is to accommodate variousheights of ceilings to which my machine is-to be installed.

On the outer tube of the columns 7 are formed projecting trunnions 12 onwhich is pivotally supported the supporting frame 13 which consists of apair of side bars 14 connected together near the front by the cross bar15, the front ends of the side bars being bent downwardly and providedwith the journal boxes 16 in which is supported a shaft 17, the samebeing held from lateral motion by the collars 18.

On the ends of the shaft 17 is mounted a pulley 19 which is constructedof a pulley block 20 having a central shaft boxing 21 and a roundedperiphery Over this is placed a covering 23 of resilient material suchas canvas, or the like, and the ends 24 attached to the sides of thepulley block 20. Between the cover 23 and the block is placed a quantityof filling material 25 to provide suitable resiliency so as to permitthe covering to conform with the irregular curvatures of the work to besanded. Over these pulleys are passed endless abrasive belts 26 such asare commonly known in the trade as sand or emery belts, said belts beingoperated by pulleys 27 mounted upon a line shaft 28 driven by the pulley29 and drivebelt 30. This shaft 28 is suspended in hang ers 31 of theusual type and at a suitable distance to the rear of the columns.

On the side bars 14 of the supporting frame is formed perforated lugs 32in each of which are located short shafts 33 on the outer ends of whichis supported an arm 34 carrying an idler 35 which contacts with theabrasive belt, keeping the same in taut position. On the opposite orinner end of the short shafts is mounted an adjustable counterbalancingweight 36 and arranged to regulate the pressure of the idler onthe belt.

In order to support the frame 13 in a rigid set position above the table37, I provide two guy rods 38 each provided with turn buckles 39 foradjustment, and extended upwardly in crossed manner and rigidly attachedto the timbers of the upper floor, the lower ends of said rods flattenedas shown in Fig. 6, provided with an elongated slot 40 through which abolt is inserted, and by said bolt the flattened ends are adjustablyheld against the side bars 14. For an additional safe-guard insupporting the frame in an elevated position, I provide the rod andchain connection 41.

On the table 37 which is supported on suitable standards, I operate acarriage 42 consisting of a body 43 having handles 44 held by theoperator. The opposite end of said body has a cross-bar 45 to which ispivoted a caster-supported frame 46. On the carriage is placed thearticle to be worked and is brought up against the abrasive belt underthe pulleys 19 (see Fig. 1), and in this manner the operator cancarefully observe the progress of and manner in which the article isbeing sanded.

This construction of machine is adapted for sanding articles havingirregular or curved surfaces, such as hollow chair bottoms and the like.

The essential feature of my invention is the applicability of endlessabrasive belts operating over resilient pulleys against which thematerial to be sanded is brought in contact face up, so that theprogress of sanding can be closely observed by the operator.

Having thus fully described my invention, what I claim as new and desireto have secured to me by the grant of Letters Patent, is:

1. A sanding machine comprising a pair of vertical adjustable columns, atable secured to said columns, a frame pivotally mounted to each of saidcolumns, a shaft supported on the free end of said frame, a pair ofresilient pulleys supported on the projecting ends of said shaft,driving pulleys, and endless abrasive belts operating over the resilientpulleys in combination with a carriage operating on the table and onwhich the material to be sanded is supported and brought in contact withthe tftbliftSlVe belt face up, substantially as speciiec.

2. A sanding machine comprising a pair of vertical columns, each columnadjustably mounted so as to be supported to the floor 1 and ceiling atvarious heights, 21 table connected to the columns, a frame pivotallyconnected to each of said columns, a shaft revolubly mounted on the freeend of the frame, a resilient pulley mounted on each projecting end ofthe shaft, driving pulleys mounted in hangers and supported to theceiling, an endless abrasive belt operating over the driving pulleys andresilient pulleys, idlers mounted on the frame and contacting with theabrasive belts for keeping the same in taut position in combination witha carriage supporting the material to be sanded mounted upon the tableand brought in contact with the abrasive belts, substantially asspecified.

In testimony whereof, I have signed my name to this specification, inpresence of two subscribing witnesses.

ALFRED A. EICKS, lVAL'rnR O. STEIN.

